Improvement in punching-machines



J. M. LAUGHLIN. Punching-Machines.

Patented Septembgr2,1873.

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UNITED STATES PATENT OEEIoE.

JOSEPH M. LAUGHLIN, OF BOSTON, MASSACHUSETTS.

IMPROVEMENTJN PUNCHlNG-MACHINES. I

Specification forming part of Letters Patent No. 142,403, datedSeptember 2, 1873; application filed November 18, 1872.

' To all whom it may concern the presser-l'oot or stock-holder, operatedautomatically by means of a suitable spring or springs, or theirequivalents, inclosed or attached in a suitable manner to the head orplunger to which the dies are secured, of a lip upon the stock-holder tolimit the extent to which the stock shall be introduced, and to hold thestock in its proper position during the punching of the same.

On the drawing, Figure 1 is a longitudinal section of the plunger, towhich the dies are secured. Fig. 2 is a cross-section over the line a: wtaken on Fig. 1. Fig. 3 is a section over the line 3/ y taken on Fig. 2.Fig. 4 is a side view of the presser-foot.

Similar letters refer to similar parts wherever they occur on thedrawings.

a is the head or plunger on an ordinary punching-machine, to the lowerend of which is secured one or more dies, 12 b, in a suitable manner, asshown. The drawing shows the dies as made for the purpose of punchinghorseshoe -nails, but my invention is likewise adapted for the punchingof any other stock to equal advantage. In the head a. is made a recess,0, in which the coiled spring (1 is placed that presses on a plate, c,attached to or slipped over the presser-foot bar f, as shown. The lowerend of the presser-foot bar f is made forked, and projects below thedies b b when in its lowest position, as shown at g g on Fig. 3. h hrepresent the stock. It is a punched nail, and h is the stock that is tobe punched.

As the head a, with the dies 1) b and the presser-feet or stock-holder gg, descends, the stock h It comes first in contact with the stockholderg 9 that keeps the stock firmly in position by the pressure from thespring. 01, and holds it so during the punching of the stock. When thehead a is raised the dies 1) I) first rise above the stock it h, but thepresserfoot y g continues to press on the stock, and only releases itspressure thereon during the time when the stock is fed; and as soon asthis is done the head a moves downward, when the presser-foot g comesagain in contact with the stock, and holds it in position during thepunching of the same.

For certain kinds of work it may be necessary to provide one or all ofthe presser-feet g g g g with a lip, i, as shown in Fig. 3, by

the use of which the stock is prevented from spreading out during thepunching of the same.

I do not confine myself .to the exact position of the presser-foot g gin relation to the dies or punches b b, as I may place the saidpresserfoot on one or both sides of the dies, as may be desired fordifferent kinds of work. I do likewise not confine myself to the exactposi- Witnesses:

ALBAN ANDREN, GEORGE E. PnELPs.

